**1. What material grade is S355J2H?**
S355J2H is a **non-alloy structural steel grade** specified in the European standard **EN 10210**. The "S" denotes structural steel, "355" indicates a minimum yield strength of 355 MPa, "J2" signifies impact toughness tested at -20°C, and "H" stands for hollow sections (e.g., tubes or hollow profiles).
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**2. What is the ASTM equivalent material to S355J2?**
The closest ASTM equivalent to S355J2 (EN 10210) is **ASTM A500 Grade C** for hollow structural sections (HSS). Both grades have comparable yield strength (355 MPa vs. 345 MPa for A500 Gr. C) and are used in similar structural applications. However, exact equivalence depends on specific requirements (e.g., chemical composition, testing standards).
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**3. What is the meaning of S355J2H N?**
The "N" in **S355J2H+N** refers to **Normalized** (or normalized rolled) condition. Normalization is a heat treatment process that refines the grain structure, improving toughness and homogeneity. This designation is common in EN 10210 for hollow sections requiring enhanced mechanical properties.
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**4. What is the chemical composition of EN 10210 S355J2H?**
The typical composition (max wt%) for **EN 10210 S355J2H** is:
- **Carbon (C):** ≤0.20%
- **Manganese (Mn):** ≤1.60%
- **Silicon (Si):** ≤0.50%
- **Phosphorus (P):** ≤0.035%
- **Sulfur (S):** ≤0.035%
Exact limits may vary slightly depending on product form and thickness. Alloying elements like Nb, V, or Ti may be added in small amounts for grain refinement.
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**5. What is the meaning of S355J2 M?**
The "M" in **S355J2+M** (per **EN 10219**) indicates **Thermomechanical Rolling** (controlled rolling followed by accelerated cooling). This process enhances strength and toughness without post-rolling heat treatment. The "M" distinguishes it from normalized ("N") or hot-finished ("H") products.
